Non-oak native plants are main hosts for sudden oak death pathogen in California

Davidson, J; Maloney, P; Hüberli, D; Koike, S; Rizzo, D; Garbelotto, M; Ivors, K

Non-oak native plants are main hosts for sudden oak death pathogen in California

Authors

Jennifer M Davidson
Patricia E Maloney
Daniel Hüberli
Steven T Koike
David M Rizzo
Matteo Garbelotto
Kelly Ivors

Authors Affiliations

J.M. Davidson is Postdoctoral Researcher, Department of Plant Pathology, UC Davis and Research Associate, Pacific Southwest Research Station, USDA Forest Service, Berkeley; P.E. Maloney is Postdoctoral Researcher, Department of Plant Pathology, UC Davis; D. Hüberli is Postdoctoral Researcher, ESPM, UC Berkeley; S.T. Koike is Farm Advisor, UC Cooperative Extension, Salinas; D.M. Rizzo is Associate Professor, Department of Plant Pathology, UC Davis. This research was supported by grants from the USDA Forest Service and the Gordon and Betty Moore Foundation. We greatly appreciate the technical assistance of A. Wickland, S. Murphy, S. Kane, C. Jensen, G. Slaughter, D. Schmidt, J. Tse, T. Harnik, K. Hayden, A. Smith, W. Van Sant and D. Henderson. The European isolates were provided by S. Werres, with additional samples from E. Hansen, K. Bovero, R. Gross, S. Tjosvold and P. Mordike. Comments on the manuscript by T. Bruns and E. Hansen were greatly appreciated; M. Garbelotto is Forest Pathology Extension Specialist and Adjunct Professor, Department of Environmental Science, Policy and Management (ESPM), UC Berkeley; K. Ivors is Postdoctoral Researcher, ESPM, UC Berkeley.

Publication Information

Hilgardia 57(1):18-23. DOI:10.3733/ca.v057n01p18. January 2003.

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Abstract

The finding of Phytophthora ramorum — the pathogen that causes sudden oak death in four California native trees — on rhododendron in Europe led us to hypothesize that its host range in California's natural forests was much greater than previously suspected. In addition to the affected oak species, we have now identified an additional 13 species from 10 plant families that act as hosts for P. ramorum in California. Our data indicates that nearly all of the state's main tree species in mixed-evergreen and redwood-tanoak forests — including the coniferous timber species coast redwood and Douglas fir — may be hosts for P. ramorum. The broad host range of P. ramorum, the variability of symptoms among different hosts and the ability of the pathogen to disperse by air suggests that it may have the potential to cause long-term, landscape-level changes in California forests.

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